I have Ubuntu 10.04 installed on my laptop, with an ATI Mobility Radeon HD 3670. I would like to connect this to an external monitor and use multiple desktops, as opposed to a single extended desktop.
I have tried selecting "Display Manager -> Multi Display -> Single display desktop (Multi-desktop)" and rebooting. This does give me two desktops, but after I move my mouse from the first desktop to the second desktop I can not move it back, and there appears to be no way to switch between the desktops.
I have read that people suggest enabling "Display Options -> Xinerama" but as far as I understand this would not dynamically adjust the set up depending on whether I have an external desktop connected.
I need a solution that will let me easily transition between one and two desktops as I often transition between using one and two screens (laptop + external monitor).
The "Single display desktop (Multi-desktop)" setting would be appropriate, if only I could figure out how to switch between these desktops.
Some people have mentioned using open source graphics drivers instead - is this likely to solve the problem? I assumed that the propriety drivers would be better.